About cocos2d-X 3.x using the engine's built-in physical engine physics

Cocos2d-x physics physical Engine

Today I was planning to use box2d physical engine, think of some time ago I heard that cocos2d-X in version 3.0 encapsulated a physical EnginePhysicsListening to the name is very domineering. It is actually much easier to use than box2d (after all, it is based on the box2d encapsulation). Well, now let's take a look at how to use the physics physical engine,

Step 1: Create a project...

Part 2: Modify the scenario Creation Method

Replace scene: Create (); with scene: createwithphysics ();

SCENE * helloworld: createscene () {// use the physical world to create a scenario. Auto scene = scene: createwithphysics (); // display the physical world debugging status. A red box is displayed, convenient debugging of scene-> getphysicsworld ()-> setdebugdrawmask (physicsworld: debugdraw_all); Auto layer = helloworld: Create (); scene-> addchild (layer); Return scene ;}

Part 3: create a world box in onenter ()

Void helloworld: onenter () {size visiblesize = Director: getinstance ()-> getvisiblesize (); // create a physical world. The size is the same as the screen size. Use the default material, the width of the debug box is three pixels: Auto Body = physicsbody: createedgebox (visiblesize, physicsbody_material_default, 3); // create a collision Image Auto edgeshape = node: Create (); // bind the image to the created world with edgeshape-> setphysicsbody (body); // set the position of the image in the middle of the screen edgeshape-> setposition (visiblesize. width/2, visiblesize. height/2); // Add the layer addchild (edgeshape );}

Let's see, a physical world of the same size as our screen is successfully created.

Part 4: Add a physical genie

Let's write a function.

Void helloworld: addsprite (cocos2d: vec2 POS) {Auto Body = sprite: Create ("closenormal.png "); // set a square to bind to the sprite body-> setphysicsbody (physicsbody: createbox (body-> getcontentsize (); Body-> setposition (POS ); addchild (body );}

We call this function in Init () and set this genie in the middle of the screen.

addSprite( Vec2( visibleSize.width / 2, visibleSize.height / 2));

Check whether something is falling, and the speed is getting faster and faster.

Yes, this image looks like a circle. Let's create a round collision image.

body->setPhysicsBody( PhysicsBody::createBox( body->getContentSize()));

Change

body->setPhysicsBody( PhysicsBody::createCircle( body->getContentSize().width / 2));

See if the image we created is a circle.

Well, it looks boring. Let's listen to another event and click it to make it more fun.

In Init (),

// Create a single touch event listener auto listener = eventlistenertouchonebyone: Create (); // the listener-> ontouchbegan = [this] (touch * t, event * E) {This-> addball (t-> getlocation (). x, t-> getlocation (). y); Return false ;}; // bind the listening object Director: getinstance ()-> geteventdispatcher ()-> addeventlistenerwithscenegraphpriority (listener, this );

Okay, you're done.

About cocos2d-X 3.x using the engine's built-in physical engine physics